fix: give the fork-lock test hooks C linkage (#619)

CMakeLists.txt

@@ -854,7 +854,7 @@ endif()
 # set language for source files now
 if(MI_USE_CXX)
   set_source_files_properties(${mi_sources} PROPERTIES LANGUAGE CXX )
-  set_source_files_properties(test/test-diagnostic-walks.c test/test-snapshot-walk.c test/test-fork-locks.c PROPERTIES LANGUAGE CXX)
+  set_source_files_properties(test/test-diagnostic-walks.c test/test-snapshot-walk.c PROPERTIES LANGUAGE CXX)
   # #272 (P7b): test-purge-holes.c and test-profile-race.c reach `mimalloc/internal.h`
   # (`_mi_ptr_page`, `mi_page_block_is_purged`, `_mi_os_page_size`, ...), which is NOT wrapped
   # in `extern "C"`. With MI_USE_CXX the library's symbols are C++-mangled, so a C test cannot

include/mimalloc/internal.h

@@ -246,11 +246,18 @@ void          _mi_fork_lock_order_observe(const mi_lock_t* lock);
 // #270: test-only hooks (test/test-fork-locks.c) that let a test GUARANTEE the main
 // subprocess's `heaps_lock` is held -- and the list it guards visibly poisoned -- at the
 // moment of fork(), instead of relying on a probabilistic race. See fork.c's
-// "MI_DEBUG-only test hooks" section.
+// "MI_DEBUG-only test hooks" section. C linkage, so a C test links them even when the
+// library is compiled as C++ (#619).
+#ifdef __cplusplus
+extern "C" {
+#endif
 void          _mi_test_hold_heaps_lock(void);
 bool          _mi_test_heaps_lock_is_held(void);
 void          _mi_test_release_heaps_lock(void);
 bool          _mi_test_heaps_lock_poison_observed(void);
+#ifdef __cplusplus
+}
+#endif
 #endif
 
 void*         _mi_meta_zalloc( mi_subproc_t* subproc, size_t size, mi_memid_t* memid );

rust/mimalloc-pprof/vendor/mimalloc-pprof-amalgamated.c

@@ -1,4 +1,4 @@
-/* GENERATED FILE -- DO NOT EDIT. Produced by rust/xtask from commit 322fd835 of src/static.c. Regenerate with: cargo run -p xtask -- amalgamate-c */
+/* GENERATED FILE -- DO NOT EDIT. Produced by rust/xtask from commit eea88676 of src/static.c. Regenerate with: cargo run -p xtask -- amalgamate-c */
 
 /* ---- begin inlined: src/static.c ---- */
 /* ----------------------------------------------------------------------------
@@ -4943,11 +4943,18 @@ void          _mi_fork_lock_order_observe(const mi_lock_t* lock);
 // #270: test-only hooks (test/test-fork-locks.c) that let a test GUARANTEE the main
 // subprocess's `heaps_lock` is held -- and the list it guards visibly poisoned -- at the
 // moment of fork(), instead of relying on a probabilistic race. See fork.c's
-// "MI_DEBUG-only test hooks" section.
+// "MI_DEBUG-only test hooks" section. C linkage, so a C test links them even when the
+// library is compiled as C++ (#619).
+#ifdef __cplusplus
+extern "C" {
+#endif
 void          _mi_test_hold_heaps_lock(void);
 bool          _mi_test_heaps_lock_is_held(void);
 void          _mi_test_release_heaps_lock(void);
 bool          _mi_test_heaps_lock_poison_observed(void);
+#ifdef __cplusplus
+}
+#endif
 #endif
 
 void*         _mi_meta_zalloc( mi_subproc_t* subproc, size_t size, mi_memid_t* memid );